AQA A LEVEL CHEMISTRY - PAPER 3 EXPERIMENTS
QUESTIONS WITH RIGHT ANSWERS.
Make,Up,a,Volumetric,Solution,,,ANS,-1.,Weigh,dry,weighing,boat
2.,Place,mass,of,solid,into,the,boat,and,weigh,accurately
3.,Pour,solid,into,a,beaker.,Reweigh,empty,weighing,boat,and,calculate,how,much,was,transferred
4.,Add,deionised,water,and,stir,with,glass,rod,until,dissolved
5.,Funnel,into,a,volumetric,flask
6.,Make,up,to,mark,with,deionised,water,until,bottom,of,meniscus,is,on,the,mark
7.,Stopper,and,invert,to,mix
Acid-Base,Titration,,,ANS,-1.,Fill,a,burette
2.,Use,a,pipette,to,transfer,25cm³,of,the,other,solution,into,the,conical,flask
3.,Add,2-3,drops,of,indicator
4.,Start,adding,from,the,burette,,swirling,constantly,,until,the,indicator,changes,colour.,Record,how,much,
solution,was,added,(rough,titre)
5.,Repeat,to,get,concordant,results,and,calculate,a,mean,titre
Measuring,Enthalpy,Change,of,Combustion,,,ANS,-1.,Measure,100cm³,of,water,into,a,calorimeter
2.,Weigh,the,spirit,burner
3.,Measure,initial,temperature,of,the,water
4.,Clamp,calorimeter,above,spirit,burner,
5.,Light,the,spirit,burner,
6.,Heat,until,the,temperature,rises,by,15°C.,Stir,and,record,final,temperature,
7.,Reweigh,spirit,burner
8.,Calculate,temperature,change,and,heat,energy,change,(q=mcAT)
9.,Calculate,mass,of,fuel,used,and,moles,of,fuel,used.,Calculate,energy,change,per,mole.
Measuring,Enthalpy,Change,of,Neutralisation,,,ANS,-1.,Place,polystyrene,cup,in,glass,beaker
, 2.,Measure,out,25cm³,of,1moldm³,HCl,and,transfer,to,polystyrene,cup
3.,Stir,and,record,temperature
4.,Measure,out,25cm³,of,1moldm³,NaOH,into,another,measuring,cylinder.,
5.,Add,NaOH,to,HCl,,stir,and,record,the,highest,temperature,reached,
6.,Calculate,temperature,change,and,q=mcAT
7.,Calculate,moles,of,acid,used,and,water,formed,,and,the,enthalpy,of,neutralisation
Investigating,Effect,of,Temperature,on,Rate,of,Reaction,,,ANS,-
1.,Measure,out,50cm³,of,aqueous,solution,A,and,pour,into,a,clean,dry,250cm³,conical,flask
2.,Measure,out,5cm³,of,aqueous,solution,B,and,pour,into,test,tube
3.,Place,conical,flask,on,a,piece,of,laminated,paper,with,a,cross.,Add,the,acid,and,start,the,stopwatch
4.,Gently,stir,and,record,initial,temperature
5.,Watch,over,the,top,and,time,how,long,it,takes,for,the,precipitate,to,form,and,cross,to,disappear
6.,Note,the,final,temperature,and,calculate,the,initial,and,final,temperatures
e.g,sodium,thiosulfate,and,acid:
Na2S2O3,+,2HCl,-->,S,+,SO2,+,H2O,+,2NaCl
Preparing,an,Organic,Liquid,,,ANS,-Heat,under,reflux.,
Most,organic,liquids,are,flammable,=,water,bath.
Anti-Bumping,Granules,,,ANS,-
Small,,rough,pieces,of,silica,that,are,added,to,the,mixture,before,reflux.,They,provide,a,rough,surface,on,
which,small,gas,bubbles,can,grow,,avoiding,bumping.,They,promote,smooth,,even,boiling.
Separating,a,Crude,Product,,,ANS,-Distillation,apparatus.
Solvent,Extraction,(Purifying,Product),,,ANS,-
1.,Place,organic,liquid,in,separating,funnel,and,add,a,portion,of,aqueous,solution
2.,Stopper,+,shake,,releasing,the,pressure,by,inverting,and,opening,the,tap
QUESTIONS WITH RIGHT ANSWERS.
Make,Up,a,Volumetric,Solution,,,ANS,-1.,Weigh,dry,weighing,boat
2.,Place,mass,of,solid,into,the,boat,and,weigh,accurately
3.,Pour,solid,into,a,beaker.,Reweigh,empty,weighing,boat,and,calculate,how,much,was,transferred
4.,Add,deionised,water,and,stir,with,glass,rod,until,dissolved
5.,Funnel,into,a,volumetric,flask
6.,Make,up,to,mark,with,deionised,water,until,bottom,of,meniscus,is,on,the,mark
7.,Stopper,and,invert,to,mix
Acid-Base,Titration,,,ANS,-1.,Fill,a,burette
2.,Use,a,pipette,to,transfer,25cm³,of,the,other,solution,into,the,conical,flask
3.,Add,2-3,drops,of,indicator
4.,Start,adding,from,the,burette,,swirling,constantly,,until,the,indicator,changes,colour.,Record,how,much,
solution,was,added,(rough,titre)
5.,Repeat,to,get,concordant,results,and,calculate,a,mean,titre
Measuring,Enthalpy,Change,of,Combustion,,,ANS,-1.,Measure,100cm³,of,water,into,a,calorimeter
2.,Weigh,the,spirit,burner
3.,Measure,initial,temperature,of,the,water
4.,Clamp,calorimeter,above,spirit,burner,
5.,Light,the,spirit,burner,
6.,Heat,until,the,temperature,rises,by,15°C.,Stir,and,record,final,temperature,
7.,Reweigh,spirit,burner
8.,Calculate,temperature,change,and,heat,energy,change,(q=mcAT)
9.,Calculate,mass,of,fuel,used,and,moles,of,fuel,used.,Calculate,energy,change,per,mole.
Measuring,Enthalpy,Change,of,Neutralisation,,,ANS,-1.,Place,polystyrene,cup,in,glass,beaker
, 2.,Measure,out,25cm³,of,1moldm³,HCl,and,transfer,to,polystyrene,cup
3.,Stir,and,record,temperature
4.,Measure,out,25cm³,of,1moldm³,NaOH,into,another,measuring,cylinder.,
5.,Add,NaOH,to,HCl,,stir,and,record,the,highest,temperature,reached,
6.,Calculate,temperature,change,and,q=mcAT
7.,Calculate,moles,of,acid,used,and,water,formed,,and,the,enthalpy,of,neutralisation
Investigating,Effect,of,Temperature,on,Rate,of,Reaction,,,ANS,-
1.,Measure,out,50cm³,of,aqueous,solution,A,and,pour,into,a,clean,dry,250cm³,conical,flask
2.,Measure,out,5cm³,of,aqueous,solution,B,and,pour,into,test,tube
3.,Place,conical,flask,on,a,piece,of,laminated,paper,with,a,cross.,Add,the,acid,and,start,the,stopwatch
4.,Gently,stir,and,record,initial,temperature
5.,Watch,over,the,top,and,time,how,long,it,takes,for,the,precipitate,to,form,and,cross,to,disappear
6.,Note,the,final,temperature,and,calculate,the,initial,and,final,temperatures
e.g,sodium,thiosulfate,and,acid:
Na2S2O3,+,2HCl,-->,S,+,SO2,+,H2O,+,2NaCl
Preparing,an,Organic,Liquid,,,ANS,-Heat,under,reflux.,
Most,organic,liquids,are,flammable,=,water,bath.
Anti-Bumping,Granules,,,ANS,-
Small,,rough,pieces,of,silica,that,are,added,to,the,mixture,before,reflux.,They,provide,a,rough,surface,on,
which,small,gas,bubbles,can,grow,,avoiding,bumping.,They,promote,smooth,,even,boiling.
Separating,a,Crude,Product,,,ANS,-Distillation,apparatus.
Solvent,Extraction,(Purifying,Product),,,ANS,-
1.,Place,organic,liquid,in,separating,funnel,and,add,a,portion,of,aqueous,solution
2.,Stopper,+,shake,,releasing,the,pressure,by,inverting,and,opening,the,tap
